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How to compress a PDF without wrecking the quality
20 January 2026 · 5 min read
Most oversized PDFs are oversized for one reason: images. A ten-page report with a handful of full-resolution photographs can easily be twenty times larger than the same report with sensibly sized images, and email attachment limits do not care about your deadline.
Choosing a compression level
- High quality, best for documents you will print, or anything with fine diagrams and small type.
- Medium, the sensible default for email and portals. Text stays crisp; photographs lose detail you would need to zoom in to notice.
- Low, for archives and quick previews where the smallest possible file matters more than image fidelity.
When compression will not help
A PDF that is mostly vector text is already about as small as it gets. If compression barely changes the size, the weight is probably coming from embedded fonts or attachments rather than images, in that case, exporting a fresh PDF from the source document usually helps more.
Sending it somewhere specific?
If the reason you're compressing is a strict email attachment limit, the exact target size matters more than the quality slider, see how to compress a PDF for email for the numbers most providers actually enforce.
Ready to try it yourself?
Compress Your PDFFrequently asked questions
Will compressing my PDF blur the text?
No. Compression here targets embedded images, not text, since text in a PDF is stored as vector data or font references, not pixels. Text stays sharp at any compression level.
What's the difference between Medium and Low compression?
Medium keeps photographs recognizable at normal reading zoom; Low pushes image quality further down to prioritize the smallest possible file size, which is useful for archives rather than anything you'll print.
Can I compress a PDF that's already been compressed once?
You can, but expect a much smaller size reduction the second time, since most of the recoverable size was already removed on the first pass.